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Patented May 23, I899.

No. 625,3l6.

E. S.v BRADFORD. FASTENING DEVICE. FOR SECURING PRINTING PLATES TD CYLINDERS.

(Application; filed Jan. 7, 1899.) (No Model.) 2 $heets-Sheet l.

UNITED STATES PATENT OFFICE.

EUGENE S. BRADFORD, OF NEW YORK, N. Y., ASSIGNOR TO THE STEEL PLATE PRINTING COMPANY, OF CAMDEN, NE\V JERSEY, AND PHILA- DELPHIA, PENNSYLVANIA.

FASTENING DEVICE FOR SECURING PRINTING-PLATES T0 CYLINDERS SPECIFICATION forming part of Letters Patent No. 625,316, dated May 23, 1899.

Application filed January 7, 1899. Serial No. 701,439. (No model.)

T0 to whom. it may concern.-

Be it known that I, EUGENE S. BRADFORD, a citizen of the United States, residing at the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Fastening Devices for Securing Printing-Plates to Supporting-Cylinders in Printing-Presses, of which the following is a specification.

My invention has relation to printingpresses, and particularly in such connection does it relate to means or fastening devices for securing a printing-plate to a supportingcylinder in a printing-press.

The principal object of my present invention is to provide simple and effective means or fastening devices for securing a printingplate to the supportin g-cylinder of a print-ingpress.

My invention consists of the improvements in a printing-press when constructed and arranged in substantially the manner hereinafter described and claimed.

The nature and characteristic features of my present invention will be more fully understood from the following description,taken in connection with the accompanying drawings, forming part hereof, in which Figure 1 is a sectional view of a portion of a printing-press, illustrating the plate and impression cylinders thereof in side elevation and the said view embodying also the particular features of my present invention. Fig. 2 is a top or plan view of the plate-cylinder. Fig. 3 is a transverse sectional View, enlarged, through the upper portion of the plate-cylinder. Fig. 4 is a side elevational view, partly sectioned, of Fig. 8. Fig. 5 is a transverse sectional view through the plate-cylinder, showing-a modified form of means or devices for fastening or clamping the printing-plate to its cylinder. Fig. 6 is a top or plan view of Fig. 5, partly sectioned. Fig. 7 is a side elevational view of Fig. 6, showing one of the clamps of the said fastening meansin inoperative posi-' tion. Figs. 8 and 9 are detail views of the clamps for holding the plate to its supportingcylinder, as shown in Figs. 1 to 7 and Fig. 10 is a side elevational view of the clamp of Figs.

5, 6, and 7 adapted to permit of the insertion, actuation, and removal of the spindles or screw-bolts controlling the plate-clamps of Figs. 5 to 7.

Referring to the drawings, in the press of my said invention A is the impression-cylinder, and B is the plate-cylinder, both suitably journaled in bearings in the framework 0 of the press. The bearings b of the impression-cylinder are preferably supported in vertical guides 19, and a spring Z1 and a setscrew b are provided, whereby the position and pressure of the impression-cylinder are readily and efficiently adjusted. The printing-plate D is preferably fastened to its supporting-cylinder B by means of a clamping device E. In Figs. 2 to at, inclusive, the clamping device consists of jaws or dogs 6, arranged to slide in longitudinal guideways or slots 6 in the periphery of the cylinder B. Screw-bolts or spindles 6 work in these jaws or dogs and are held at their inner ends by plates'e engaging heads 6 on said bolts or spindles, so that as the bolts or spindles are turned one way or the other the jaws or dogs e are brought tightly against or released from the edges of the printing-plate D, which is clamped between them. The plates 6 have slots a, through which pass the fasteningbolts e so that by loosening these bolts and moving the plates downwardly the screw rods or bolts 6 together with the jaws or dogs 6, carried thereon, may be readily and quickly withdrawn, as will be clearly understood from Fig. 3 of the drawings. In the construction illustrated in Figs. 5 to 7, inclusive, the bolts e are provided with two collars e and e Located at or near one end of the cylinder B one of these collars, e is placed within the cylinder B, while the other is located beyond the end of the cylinder. 6 is an S-shaped clamp located between the two collars e and a and removably secured by means of shoulder-screws e to the face of the cylinder-B, as illustrated in Fig. 7 of the drawings. By the turning of the S-shaped clamp e the same is brought into or out of engagement with the shoulder-screws a".

By disengaging the clamp e from the shoulder-screws e the spindle or screw-bolt e with the clamp 6, can be readily withdrawn from the opening 6 of the cylinder B. By a reverse movement of the clamp e the bolt or spindle 6 can be made to be readily secured to the cylinder B by the engagement of the clamp with the shoulder-screws 6 It will be observed that the construction and arrangement of the clamps are such as to be readily or quickly brought into operative condition, secured, and withdrawn from the plate-cylinder B. V In the construction shown in Figs. 1 to 1 the openings 6, provided near the periphery of the plate-cylinderB,are separated by a partition g, provided with recesses g and g for the reception of the heads 6 of the spindles or screw-bolts e In the construction shown in Figs. 5 to 7 the openings 8 extend entirely through the cylinder. The means for holding the screw-bolts or spindles e in position are in this instance located at the free ends of the cylinder B and outside thereof, Whereas in the construction shown in Figs. 1 to 4, inclusive, the means for holding the spindles or screw-bolts e are placed near the middle of said cylinder B.

Having thus described the nature and object of my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a machine of the character described, a plate-cylinder having openings or grooves therein, a plate-holder consisting of dogs mounted on spindles or screw-bolts and mow able in the openings or grooves of said cylinder, and clamps, consisting of plates movable so as to connect and disconnect said screw-bolts or spindles to and from said cyl inder, substantially as and for the purposes described.

2. In a machine of the character described, 40

a plate-cylinder having longitudinal openings or grooves therein, a plate-holder consisting of dogs mounted on spindles or screwbolts and slidable in the grooves or openings of said cylinder, and clamps adapted to swing on said spindles or screw-bolts and with said dogs to be clamped to said cylinder, substantially as and for the purposes described.

3. In a machine of the character described,

a plate-cylinder, means for clamping a plate to said cylinder consisting of dogs slidable .in grooves or openings of said cylinder, spindles or screwbolts traversing said dogs, and

S-shaped clamps adapted to swing on said spindles or screw-bolts, substantially as and for the purposes described.

4:. In a machine of the character described, a plate cylinder, dogs adapted to be brought into and out of engagement with the plate of said cylinder, spindles or screw-bolts operat- 6o ing said dogs, and S-shaped clamps adapted to be swung into and out of engagement with the bolts of said plate-cylinder, substantially as and for the purposes described.

In testimony whereof I have hereunto set 

